题目内容：

假设英语课上老师要求同桌之间交换修改作文, 请你修改你同桌写的以下作文。文中共有10处错误，每句中最多有两处错误。错误涉及一个单词的增加、删除或修改。

增加：在缺词处加一个漏字符号（∧）, 并在其下面写出该加的词。

删除：把多余的词用斜线（＼）划掉。

修改：在错的词下划一横线，并在该词下面写出修改后的词。

注意：

1．每处错误及其修改均仅限一词；

2．只允许修改10处，多者（从第11处起）不计分。

Mr. Zhang is sixty years old and had retired. He taught our biology when we were in Grade One. He taught very good. He tried his best to make his classes lively. He usually made good preparations for the lessons and was strict in us. Each time when we made mistakes in our homework, he would ask us to correct it. I was poor in biology. He often helps me with my study

patiently. With his help I made great progresses. He was very kind to his students. As experienced teacher, he was respected or loved by all the students.